The below article talks about the SIC's log files which should show you whether or not it's being used:
http://www.symantec.com/docs/HOWTO81025
Whereas this other article describes the various settings within the SIC:
http://www.symantec.com/docs/HOWTO81023
NOTE: by default, a username and password are not required.
You should also see from the "Scan Details" logs on either the SEP client or from the SEPM itself, the number of "files skipped" increasing.